I would assume that they would do so because they like it. A better question would be, "why do you like looking like that?". To which an answer may be, "why do you feel it necessary to ask?". And so on and so forth.

Why would you ever want to be 25+ and sit on an internet ski forum all day every day flexing your e-muscles?

Well, I mean I heard that if you in a get it out...

Stevens. Stay away from baker, all it does is rain, which makes for horrible snow pack causing some of the biggest avalanches in the world, like they're fucking massive man. All the locals do is bitch about fucking canadians coming down, and crashing there Audi S4's on the 542. Fuck this shit just stay in NH.-Bakerpow

Lol at thinking I "sit on an internet ski forum all day every day." It takes like 20 seconds to make a post. I just keep NS open in a tab in my browser and occasionally check to see what's going on. I'm sitting at my parents' house watching football looking at random shit on the internet. Do you have a better suggestion for what I should be doing with my time?

He's a pro skier.
Doctors wear surgical coats.
Lawyers wear suits.
Skiers wear tee shirts and shorts, it's his lifestyle, he doesn't have to give a shit to be successful. Whens the last time you saw a pro skateboarder wearing a sport jacket?

What is with these children and their hingerboppin shenanigans you know. Im trying to practice my balance on the orange oval trails when some flaming' kid with his double curved feet swords comes flyin' by me at 5000 cm/sec backwards. Next thing i know he's doing a whirly boop backward full flip kamikaze grab

We're trying to help, so that in 10 years he wont look back at himself as a teenager and want to shoot commit suicide. We're being the nice ones here by saying he looks like a tool. OP you probably look like a tool.